* {
	margin:0px;
	padding:0px;
	list-style:none
}
#nav {
	width:820px;
	margin:0 auto;
}
#list>li {
	width:200px;
	height:30px;
	background:yellow;
	float:left;
	line-height:30px;
	text-align:center;
	margin-left:5px;
}
#list li ul {
	position:absolute;
	width:200px;
	height:0px;
	overflow:hidden;
	background:#c0c0c0;
}
#list li ul li {
	height:30px;
}
#list li ul li>a{
	display:block;
	width:inherit;
	height:inherit;
	text-decoration: none;
	color: black;
}
#list li ul li>a:hover{
	background-color: #808080;
	
}
